急性肾功能衰竭无尿是指成人每24小时尿量为
A．不足50mlB．完全无尿C．少于250mlD．少于20mlE．少于150ml
参考答案：A
Tipping is neither encouraged nor common, although visitors may reward special services if they wish, _________ 10% of the bill is enough.
A which B where C in which D in which case
戴明循环提出的管理循环理论将管理活动分为（）个阶段
A.2
B.3
C.4
D.5
